CN111413018B - Prestress monitoring method for stress control type reinforcement inclusion - Google Patents
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Abstract
The invention discloses a prestress monitoring method for a stress control type reinforced inclusion, which comprises a tension member for loading prestress, wherein the tension member comprises a first connecting piece and a second connecting piece, and an elastic component for storing force is connected between the first connecting piece and the second connecting piece; the method comprises the following steps: firstly, mounting a detection device on a tension member, wherein the monitoring device comprises a first polar plate and a second polar plate which are parallel to each other and are arranged oppositely, and the first polar plate and the second polar plate are respectively used for being fixedly mounted on a first connecting piece and a second connecting piece; the first polar plate and the second polar plate are also connected with a measuring circuit for detecting capacitance change between the first polar plate and the second polar plate; and calculating the distance between the first polar plate and the second polar plate by measuring the capacitance between the first polar plate and the second polar plate detected by the measuring circuit in real time to obtain the actual deformation of the elastic component so as to calculate the prestress. The invention has the advantages of simple installation, convenient operation and use, contribution to reducing the construction difficulty, capability of monitoring the stress change and the like.
Description
Technical Field
The invention relates to the technical field of civil engineering, in particular to a prestress monitoring method for a stress control type reinforcement inclusion.
Background
With the development of social technology and economy, people have higher and higher requirements on the aspects of structural stability and functional diversity of buildings, material saving, high-efficiency and economical materials and the like. By prestressing the member prior to loading, not only is the member's resistance to cracking and stiffness improved, but the life of the structural member is also increased. Therefore, the inventor has applied for a stress control type reinforcement inclusion structure and a Chinese patent of a foundation treatment construction method thereof, the application number is 2014107868852, the concrete structure is shown in figure 1, the stress control type reinforcement inclusion structure comprises at least one layer of geotechnical pad and a stress applying device; the geotechnical pad comprises a geogrid 1, a geotechnical non-woven fabric and a filler from outside to inside, wherein the geotechnical non-woven fabric is arranged on the inner side of the geogrid 1, and the filler is placed on the inner side of the geotechnical non-woven fabric; wherein, the stress applying device comprises upper and lower pressing plates 21, 22 and a tension member disposed between the upper and lower pressing plates 21, 22 for tensioning the upper and lower pressing plates 21, 22; the tension member comprises a connecting rod, the upper end of the connecting rod extends out of the upper pressure plate 21, the upper end of the connecting rod is provided with a nut 8 for screwing, the lower end of the connecting rod extends out of the lower pressure plate 22, and the lower end of the connecting rod is provided with a bolt 3; the connecting rod comprises lower connecting rod 4, upper connecting rod 5 and the spring 6 of setting between lower connecting rod 4 and upper connecting rod 5, the one end of spring 6 is connected with the lower extreme of upper connecting rod 4, and the other end of spring 6 is connected with the upper end of lower connecting rod 4. The section mechanical property of the whole reinforcement inclusion is changed by actively applying stress on the outer wrapping ribs through tensile stress applied by the tension members, so that the overall strength of the reinforcement inclusion is improved, and the deformation resistance of the reinforcement inclusion is improved.
However, due to the fact that the prestressed member is subjected to corrosion of different degrees, uneven settlement of a foundation, material characteristics and the like in the long-term use process, the working performance and stability of the structural member are affected by the loss of the prestress, and therefore it is necessary to establish an effective prestress monitoring and early warning device to monitor the prestressed structure in service.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: how to provide a prestressing force monitoring method for stress control formula adds muscle inclusion that the installation is succinct, operation convenient to use is favorable to reducing the construction degree of difficulty, can implement the monitoring stress change.
In order to solve the technical problems, the invention adopts the following technical scheme:
a prestress monitoring method for a stress control type reinforcement inclusion comprises a tension member for loading prestress, wherein the tension member comprises a first connecting piece and a second connecting piece, and an elastic component for storing force is connected between the first connecting piece and the second connecting piece; the method is characterized by comprising the following steps:
s1, firstly installing a detection device on the tension member, wherein the detection device comprises a first polar plate and a second polar plate which are parallel to each other and oppositely arranged, and the first polar plate and the second polar plate are respectively used for being fixedly installed on the first connecting piece and the second connecting piece; the first polar plate and the second polar plate are also connected with a measuring circuit for detecting capacitance change between the first polar plate and the second polar plate;
S2, calculating the distance between the first polar plate and the second polar plate through the capacitance between the first polar plate and the second polar plate detected by the measuring circuit in real time, and obtaining the actual deformation of the elastic component to calculate the prestress, thereby realizing the monitoring of the prestress.
When the prestress of the tension member is changed, the length of the elastic member connected between the first link and the second link, which stores force, is changed. The first polar plate and the second polar plate which are arranged oppositely in parallel are respectively and fixedly arranged on the first connecting piece and the second connecting piece of the tension member, the distance between the first connecting piece and the second connecting piece is changed by the length change of the elastic component, and further the distance between the first polar plate and the second polar plate which are fixedly arranged on the first connecting piece and the second connecting piece is changed, so that the capacitance between the first connecting piece and the second connecting piece is changed, the change of the distance between the first polar plate and the second polar plate can be reversely calculated by the change of the capacitance between the first polar plate and the second polar plate, and the monitoring of the prestress on the tension member can be realized.
Further, in step S1, the first pole plate and the second pole plate are both circular, and opposite sides of the first pole plate and the second pole plate are respectively provided with a first pole plate wall and a second pole plate wall which are integrally cylindrical, an outer diameter of the first pole plate wall is smaller than an inner diameter of the second pole plate wall, and one end of the first pole plate wall facing the second pole plate is axially movably sleeved in the second pole plate wall; in step S2, before monitoring, a group of the first plate, the first plate wall, the second plate and the second plate wall is selected to change the distance between the first plate and the second plate, and the capacitance is detected by using the measuring circuit to determine the correspondence between the distance between the first plate and the second plate and the capacitance.
One end of the first plate wall is sleeved in the second plate wall, so that an overlapping area is formed between the first plate wall and the second plate wall in the radial direction, a capacitor is formed between the first plate wall and the second plate wall, once the prestress changes, the overlapping area of the area also changes, and the overlapping area has smaller distance, so that the response to the change of the capacitor is more sensitive, and the detection precision can be improved. Since the structure has both the capacitance change formed between the first plate and the second plate and the capacitance change formed between the wall of the first plate and the wall of the second plate, it becomes more complicated to directly calculate the distance between the first plate and the second plate by the detected capacitance. Therefore, before monitoring, the corresponding relation between the distance between the first polar plate and the second polar plate and the capacitance is determined through the measuring circuit, so that the detection is quicker, and the detection result is more accurate.
Preferably, in step S1, a first filling layer and a second filling layer made of an insulating material are respectively disposed on the outer side of the first plate wall and the inner side of the second plate wall, and an outer diameter of the first filling layer is identical to an inner diameter of the second filling layer.
Because the outer diameter of the first filling layer is consistent with the inner diameter of the second filling layer, when the first polar plate and the second polar plate move along with the first connecting piece and the second connecting piece, the first polar plate and the second polar plate can be always coaxial, the capacitance change between the first polar plate and the second polar plate is controllable, and the detection result is more reliable.
Preferably, in step S1, a first thermal insulation layer and a second thermal insulation layer made of thermal insulation material are respectively disposed on the inner side of the first plate wall or/and the outer side of the second plate wall.
Therefore, the capacitance change caused by expansion with heat and contraction with cold due to the change of the external temperature can be avoided as much as possible, and the detection accuracy and reliability are ensured.
Further, in step S1, the first plate wall and the second plate wall are both in a truncated cone shape, and the tapers of the first plate wall and the second plate wall are equal to each other; the diameter of the first polar plate wall is gradually reduced along the direction departing from the first polar plate, and the diameter of the second polar plate wall is gradually increased along the direction departing from the second polar plate.
Because the first plate wall and the second plate wall are in the shape of the circular truncated cone with the same taper, when the first plate wall and the second plate wall move relatively in the axial direction, the distance between the overlapping areas of the first plate wall and the second plate wall changes, so that the capacitance change between the first plate wall and the second plate wall is influenced by the double effects of the plate distance and the overlapping area, and the detection sensitivity is improved.
Further, in step S1, the outer wall of the first filling layer has a first rib or a first groove disposed along the axial direction, the inner wall of the second filling layer has a second groove or a second rib disposed along the axial direction and corresponding to the first rib or the first groove, and the first rib is matched with the second groove or the first groove is matched with the second rib.
Thus, the relative positions of the first and second electrode walls in the circumferential direction can be restricted by the cooperation of the first rib and the first groove or the cooperation of the second groove and the second rib, so that the detected capacitance is affected only by the axial change of the tension member, thereby improving the accuracy and reliability of the detection.
Further, in step S1, a bearing is coaxially disposed in the middle of the first pole plate or/and the second pole plate, and the bearing is fixedly mounted on the first connecting member or/and the second connecting member (201).
In this way, when the tension member rotates relative to the first connecting piece and the second connecting piece in the use process, the tension member can avoid the damage of the structures among the first polar plate, the first polar plate wall, the second polar plate and the second polar plate wall caused by applying a torsional force between the first polar plate and the second polar plate through the bearing connection, so that the reliability of the monitoring device is higher.
Further, in step S1, the bearing is a spherical joint bearing.
Therefore, when the tension member deflects relatively between the first connecting piece and the second connecting piece in the use process, the first polar plate wall, the second polar plate and the second polar plate wall can be prevented from being damaged by extrusion, and the reliability of the monitoring device is higher.
In summary, compared with the prior art, the invention has the following advantages:
1. the principle of the device is that the change of the prestress is calculated by using the change of the capacitance, and a functional relation is established among the distance between the polar plates, the capacitance and the prestress. The monitored parameters are clear and easy to obtain, and the data processing is simple, efficient and easy to understand; the device of adoption is simple, can effectual reduction construction degree of difficulty.
2. The invention adopts the variable-gap capacitance sensor, has higher sensitivity, can measure micro linear displacement and realize non-contact measurement, and indirectly reduces the measurement error.
3. The device has the advantages of convenient acquisition of the materials of all elements and low cost.
4. The device has the advantages that each part is highly integrated, the size is small, the integrity of the existing prestressed structure is not affected, the prestressed structure is buried in the ground shallowly, only the capacitance sensor and the related buried wire are arranged on the appearance, the disturbance to the soil layer is small, and the integrity of the soil layer and the durability of the whole structure are ensured;
5. the measured data can be monitored and analyzed in real time through the background of the computer data monitoring system, and timeliness of the monitoring process is guaranteed.
Drawings
Fig. 1 is a schematic diagram of a stress-controlled reinforcement package structure.
Fig. 2 is a sectional structural view illustrating an installation state of the tension member.
Fig. 3 is a sectional structural view of a portion of the tension member of fig. 2.
Fig. 4 is a schematic structural diagram of the first connecting member or the second connecting member in a deflected state.
Fig. 5 is an enlarged schematic view of the circle in fig. 4.
Detailed Description
The present invention will be described in further detail with reference to examples.
In the specific implementation: a prestress monitoring device for being installed on a tension member loaded with prestress as shown in fig. 2, wherein the tension member includes a first link 101 and a second link 102, and an elastic member 103 for accumulating force is connected between the first link 101 and the second link 102; the monitoring device comprises a first polar plate 301 and a second polar plate 401 which are parallel to each other and are arranged oppositely, wherein the first polar plate 301 and the second polar plate 401 are made of metal materials and are respectively fixedly arranged on the first connecting piece 101 and the second connecting piece 102; the first plate 301 and the second plate 401 are further connected with a measuring circuit for detecting capacitance change therebetween. The measuring circuit is a circuit for converting a capacitor into voltage or other electric quantities to detect, is mature in the prior art, is widely applied to a capacitive sensor, and can be a bridge circuit, a frequency modulation circuit, a pulse width modulation circuit, an operational amplifier circuit, a diode double-T-shaped alternating current bridge and the like in specific implementation. Since the improvement of the prior art by the present application is not a measurement circuit, it is not described herein in detail.
In use, when the prestress of the tension member is changed, the length of the resilient member connected between the first link and the second link, which stores force, is also changed. The first polar plate and the second polar plate which are arranged oppositely in parallel are respectively and fixedly arranged on the first connecting piece and the second connecting piece of the tension member, the distance between the first connecting piece and the second connecting piece is changed by the length change of the elastic component, and further the distance between the first polar plate and the second polar plate which are fixedly arranged on the first connecting piece and the second connecting piece is changed, so that the capacitance between the first connecting piece and the second connecting piece is changed, the change of the distance between the first polar plate and the second polar plate can be reversely calculated by the change of the capacitance between the first polar plate and the second polar plate, and the monitoring of the prestress on the tension member can be realized.
As shown in fig. 3, the first plate 301 and the second plate 401 are both circular, and the edges of the two extend in opposite directions to form a first plate wall 302 and a second plate wall 402 which are integrally cylindrical, the outer diameter of the first plate wall 302 is smaller than the inner diameter of the second plate wall 402, and one end of the first plate wall 302 facing the second plate 401 is axially movably sleeved in the second plate wall 402.
Therefore, one end of the first plate wall is sleeved in the second plate wall, so that an overlapping area is formed between the first plate wall and the second plate wall in the radial direction, a capacitor is formed between the first plate wall and the second plate wall, once the prestress changes, the overlapping area of the area also changes, and the overlapping area is smaller in distance, so that the response to the change of the capacitor is more sensitive, and the detection precision can be improved.
In practice, the outer side of the first plate wall 302 and the inner side of the second plate wall 402 are respectively provided with a first filling layer 303 and a second filling layer 403 made of insulating materials, and the outer diameter of the first filling layer 303 is consistent with the inner diameter of the second filling layer 403.
Because the outer diameter of the first filling layer is consistent with the inner diameter of the second filling layer, when the first polar plate and the second polar plate move along with the first connecting piece and the second connecting piece, the first polar plate and the second polar plate can be always coaxial, the capacitance change between the first polar plate and the second polar plate is controllable, and the detection result is more reliable.
In practice, the inner side of the first plate wall 302 or/and the outer side of the second plate wall 402 are respectively provided with a first heat insulation layer 304 and a second heat insulation layer 404 made of heat insulation materials.
Therefore, the capacitance change caused by expansion with heat and contraction with cold due to the change of the external temperature can be avoided as much as possible, and the detection accuracy and reliability are ensured.
As shown in fig. 3 to 5, the first plate wall 302 and the second plate wall 402 are both in a truncated cone shape, and the tapers of the two walls are equal; the diameter of the first plate wall 302 is gradually smaller in a direction away from the first plate 301, and the diameter of the second plate wall 402 is gradually larger in a direction away from the second plate 401.
Because the first plate wall and the second plate wall are in the shape of the circular truncated cone with the same taper, when the first plate wall and the second plate wall move relatively in the axial direction, the distance between the overlapping areas of the first plate wall and the second plate wall changes, so that the capacitance change between the first plate wall and the second plate wall is influenced by the double effects of the plate distance and the overlapping area, and the detection sensitivity is improved.
In implementation, the outer wall of the first filling layer 303 has a first rib or a first groove arranged along the axial direction, the inner wall of the second filling layer 403 has a second groove or a second rib arranged along the axial direction and corresponding to the first rib or the first groove, and the first rib is matched with the second groove or the first groove is matched with the second rib.
Thus, the relative positions of the first and second electrode walls in the circumferential direction can be restricted by the cooperation of the first rib and the first groove or the cooperation of the second groove and the second rib, so that the detected capacitance is affected only by the axial change of the tension member, thereby improving the accuracy and reliability of the detection.
In practice, the first polar plate 301 or/and the second polar plate 401 are coaxially provided with bearings at the middle thereof, and the bearings are fixedly mounted on the first connecting member 101 or/and the second connecting member 201.
In this way, when the tension member rotates relative to the first connecting piece and the second connecting piece in the use process, the tension member can avoid the damage of the structures among the first polar plate, the first polar plate wall, the second polar plate and the second polar plate wall caused by applying a torsional force between the first polar plate and the second polar plate through the bearing connection, so that the reliability of the monitoring device is higher.
As shown in fig. 5, the bearing is a spherical joint bearing. Therefore, when the tension member deflects relatively between the first connecting piece and the second connecting piece in the use process, the first polar plate wall, the second polar plate and the second polar plate wall can be prevented from being damaged by extrusion, and the reliability of the monitoring device is higher.
In this embodiment, the tension member of the prestressed reinforcement package shown in fig. 1 is monitored, wherein the lower connecting rod 4, the upper connecting rod 5 and the spring 6 correspond to the first connecting member 101, the second connecting member 102 and the elastic member 103 in fig. 2, respectively. In the specific monitoring process, the following steps are adopted:
1. Uniformly coating a layer of insulating paint on the spring, the upper connecting rod and the lower connecting rod, then respectively installing the first polar plate and the second polar plate on the upper connecting rod and the lower connecting rod through the joint bearing, coaxially inserting the wall of the first polar plate into the wall of the second polar plate, and adjusting the design installation positions of the joint bearing to the upper connecting rod and the lower connecting rod.
2. Before monitoring, a group of tension members and a first polar plate 301, a first polar plate wall 302, a second polar plate 401 and a second polar plate wall 402 which are arranged on the tension members are selected, an external force along the axial direction is applied to the tension members, so that the distance between the first polar plate 301 and the second polar plate 401 is changed, meanwhile, a measuring circuit is adopted to detect the capacitance of the tension members, and the corresponding relation between the distance between the first polar plate 301 and the second polar plate 401 and the capacitance is determined.
3. When the device is installed on the spot, a round hole (namely a lead hole) with a diameter slightly larger than that of a lead is processed at one side of an upper connecting rod nut of the upper supporting pressure plate so as to lead out a data transmission line; and connecting the leads on the first polar plate and the second polar plate to a measuring circuit through the lead holes.
4. The tension member provided with the detection device is arranged at each key position of the soil rock foundation where uneven settlement easily occurs, the monitoring point positions are numbered, and data collection and arrangement are facilitated.
5. The capacitance is detected by the measuring circuit, and the implementation distance between the first plate and the second plate can be determined by the corresponding relation between the distance between the first plate 301 and the second plate 401 and the capacitance, so that the displacement deformation of the elastic component can be calculated, and the stress variation can be calculated according to the displacement deformation.
The above description is only exemplary of the present invention and should not be taken as limiting, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A prestress monitoring method for a stress control type reinforcement inclusion comprises a prestress loading tension member, wherein the tension member comprises a first connecting piece (101) and a second connecting piece (102), and an elastic component (103) for accumulating force is connected between the first connecting piece (101) and the second connecting piece (102); the method is characterized by comprising the following steps:
s1, firstly installing a monitoring device on the tension member, wherein the monitoring device comprises a first polar plate (301) and a second polar plate (401) which are arranged in parallel and oppositely, and the first polar plate (301) and the second polar plate (401) are respectively used for being fixedly installed on the first connecting piece (101) and the second connecting piece (102); the first polar plate (301) and the second polar plate (401) are also connected with a measuring circuit for detecting capacitance change between the first polar plate and the second polar plate;
S2, calculating the distance between the first polar plate (301) and the second polar plate (401) by measuring the capacitance between the first polar plate (301) and the second polar plate (401) detected by the measuring circuit in real time, and obtaining the actual deformation of the elastic component (103) to calculate the prestress, thereby realizing the monitoring of the prestress;
in the step S1, the first pole plate (301) and the second pole plate (401) are both circular, and opposite sides of the first pole plate and the second pole plate are respectively provided with a first pole plate wall (302) and a second pole plate wall (402) which are integrally cylindrical, an outer diameter of the first pole plate wall (302) is smaller than an inner diameter of the second pole plate wall (402), and one end of the first pole plate wall (302) facing the second pole plate (401) is axially movably sleeved in the second pole plate wall (402); in step S2, before monitoring, a group of the first electrode plate (301), the first electrode plate wall (302), the second electrode plate (401) and the second electrode plate wall (402) is selected to change the distance between the first electrode plate (301) and the second electrode plate (401), and the capacitance of the first electrode plate (301) and the second electrode plate (401) is detected by using a measuring circuit to determine the correspondence between the distance between the first electrode plate (301) and the second electrode plate (401) and the capacitance;
A first filling layer (303) and a second filling layer (403) made of insulating materials are respectively arranged on the outer side of the first plate wall (302) and the inner side of the second plate wall (402), and the outer diameter of the first filling layer (303) is consistent with the inner diameter of the second filling layer (403); in step S1, a first heat insulation layer (304) and a second heat insulation layer (404) made of a heat insulation material are respectively disposed on the inner side of the first plate wall (302) or/and the outer side of the second plate wall (402).
2. The prestress monitoring method for the stress-controlled reinforcement enclosure according to claim 1, wherein in step S1, the first plate wall (302) and the second plate wall (402) are both in a truncated cone shape, and the tapers of the two walls are equal; the diameter of the first polar plate wall (302) is gradually reduced along the direction departing from the first polar plate (301), and the diameter of the second polar plate wall (402) is gradually increased along the direction departing from the second polar plate (401).
3. The method for monitoring prestress of stress-controlled reinforcement package according to claim 1, wherein in step S1, the outer wall of the first filling layer (303) has a first rib or a first groove disposed along the axial direction, the inner wall of the second filling layer (403) has a second groove or a second rib disposed along the axial direction corresponding to the first rib or the first groove, and the first rib is matched with the second groove or the first groove is matched with the second rib.
4. The prestress monitoring method for the stress-controlled reinforcement enclosure according to claim 3, wherein in step S1, a bearing is coaxially disposed at a middle portion of the first pole plate (301) or/and the second pole plate (401), and the bearing is fixedly mounted on the first connecting member (101) or/and the second connecting member (102).
5. The prestress monitoring method for the stress-controlled reinforcement enclosure according to claim 4, wherein in the step S1, the bearing is a spherical joint bearing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010314212.2A CN111413018B (en) | 2020-04-21 | 2020-04-21 | Prestress monitoring method for stress control type reinforcement inclusion |
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| CN202010314212.2A CN111413018B (en) | 2020-04-21 | 2020-04-21 | Prestress monitoring method for stress control type reinforcement inclusion |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000292270A (en) * | 1999-04-09 | 2000-10-20 | Furukawa Electric Co Ltd:The | Capacitance-type load sensor |
| CN104532819A (en) * | 2014-12-18 | 2015-04-22 | 重庆大学 | Stress control type reinforcement enclosure structure and foundation treatment construction method thereof |
| CN106092430A (en) * | 2016-06-16 | 2016-11-09 | 清华大学深圳研究生院 | A kind of comb capacitance type pressure transducer |
| CN106644187A (en) * | 2016-10-14 | 2017-05-10 | 沈阳市传感技术研究所 | Sapphire insulator fixed electrode capacitive pressure sensor |
| CN109238518A (en) * | 2018-09-17 | 2019-01-18 | 胡耿 | Capacitive force-sensing element and its manufacturing method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1288152A (en) * | 2000-11-08 | 2001-03-21 | 胡耿 | Condenser type force sensitive sensor with shape variable supportor |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000292270A (en) * | 1999-04-09 | 2000-10-20 | Furukawa Electric Co Ltd:The | Capacitance-type load sensor |
| CN104532819A (en) * | 2014-12-18 | 2015-04-22 | 重庆大学 | Stress control type reinforcement enclosure structure and foundation treatment construction method thereof |
| CN106092430A (en) * | 2016-06-16 | 2016-11-09 | 清华大学深圳研究生院 | A kind of comb capacitance type pressure transducer |
| CN106644187A (en) * | 2016-10-14 | 2017-05-10 | 沈阳市传感技术研究所 | Sapphire insulator fixed electrode capacitive pressure sensor |
| CN109238518A (en) * | 2018-09-17 | 2019-01-18 | 胡耿 | Capacitive force-sensing element and its manufacturing method |
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